Effect of concrete age and strength on its fracture toughness and characteristic length 混凝土断裂韧度、特征长度随强度、龄期变化规律
The paper presents a model of turbulent flow, which can exactly provide data of the characteristic length and velocity of turbulent flow. 本文介绍的紊流模型能准确提供特征速度和特征长度参数的数值。
Resulting in the characteristic length. 从而产生了特征长度。
Characteristic length of concentric sphere and concentric cylinder 同心球与同轴圆柱的特征尺度
The relation between the characteristic length and the spatially resolved reflectance of tissue close to source was studied by using P_3 approximations expression of semi-infinite turbid medium and spatial-resolved reflectance. 利用半无限介质的空间分辨漫反射的P3的近似解,对光源附近组织的空间分辨漫反射与特征长度之间的关系进行了研究。
Fault band is treated as one dimensional shear problem and the thickness of the band is dependent on characteristic length of rock. 断层带被视为一维剪切问题,断层带尺寸由岩石内部长度确定。断层带的一半及带外一侧的弹性岩石被视为一个系统。
Proposes a kind of automatic measurement system of punch needle characteristic length based on image sensor. 提出一种基于图像传感器的冲针特征长度自动测量系统。
In addition, the experimental relationships of the characteristic length, strain modulus and density, content of the unfrozen solution were given. 另外,还给出了特征长度、变形模量与冰密度和未冻液体含量的试验关系。
Making use of the Double Cantilever Beam ( DCB), we have researched the phenomenon of crack turning and done some corresponding emulation by finite element method ( FEM), and analyses the crack turning condition and influence of the characteristic length ( r_c) and fracture resistance orthotropy. 利用双悬臂梁试件,对裂纹转折现象进行了试验研究和相应的有限元模拟,并对裂纹转折条件以及特征长度γc和断裂韧性各向异性的影响作了对比分析。
Hydraulic height was selected as characteristic length and variational relation of dimensionless critical wind velocity corresponding to the 2 kinds of tunnel models vs heat releasing strength was gained, which was in a good agreement with the results of reduced-scale and full-scale tunnel fire tests. 选择断面水力高度为特征尺寸,获得2种隧道模型对应的量纲一的临界风速随热释放强度的变化关系,且其与缩尺模型试验及全尺度试验结果相比均具有较好的一致性;
Taking brittleness coefficient and characteristic length as indexes for evaluation of crack resistance of HSC, the effect of mineral admixtures including fly ash, silica fume and ground slag on crack resistance of HSC is studied. 以脆性系数和特征长度为高强混凝土抗裂性评价指标,研究矿物掺合料(粉煤灰、硅粉和磨细矿渣)对高强混凝土抗裂性的影响。
Based on gradient-dependent plasticity in which the thickness of shear band is determined by characteristic length of rock, analytical solutions of dissipated energies in axial and lateral directions of rock specimens in uniaxial compression are derived, respectively. 根据梯度塑性理论,局部化带的尺寸由特征长度确定,得到了单轴压缩岩样由于剪切局部化而引起的轴向及侧向塑性变形所耗散能量的解析解。
In the cases of high coupling numbers, the load capacity and friction resistance are higher when the ratio of lubrication film thickness to molecular characteristic length is smaller. 在高耦合数条件下,润滑油膜厚度和微极性流体分子特征尺度的比值越小,轴承的承载力和摩擦阻力越大。
The classical prediction of effective elastic properties for Cauchy mediums is recovered when the PST particle's diameter tends to infinity compared to the characteristic length of the micropolar matrix. 而当PST夹杂颗粒直径a与微极基体材料的特征长度lm相比很大时,微极理论对有效弹性模量预测的结果将趋近于采用传统Cauchy介质理论预测的结果。
Airflow in cylinder exists in the form of turbulent flow. in order to calculate the convective exchange of cylinder, we have to know the characteristic length and the characteristic velocity of airflow. 气缸内气流是以紊流形式存在,在计算气缸对流传热时要知道气流的特征速度和特征长度。
The calculation proves that it is important to the GAO-YONG turbulence equations for simulating adverse pressure gradient flow to introduce the effect of mean pressure gradient into energy equation which describes the characteristic length scale of the turbulent flow. 计算发现,在机械能方程中引入平均流压力梯度的作用,对GAO-YONG湍流方程组正确模拟逆压力梯度流动起到了关键作用。
Characteristic Length and Vertical Concentration Distribution of Suspended Sediment 泥沙悬浮的特征长度和悬移质浓度垂线分布
Numerical results of the normalized radar cross section as a function of fractal dimension, characteristic length and incidence frequency are given. Our FBM model is also compared with classical models of Gaussian and exponential correlations. 数值计算并分析了散射截面与分维、特征长度及入射频率的关系,并与高斯相关分布和指数相关分布粗糙面的散射结果做了比较。
However, differential plastic strain on a gauge length depends on specimen length, softening modulus, differential axial stress, and thickness of tensile localized band. The thickness is determined by gradient-dependent plasticity where a characteristic length is included in yield function. 塑性应变的微分与应力的微分、试样高度、软化模量及局部化带的厚度有关,局部化带的厚度由梯度塑性理论确定。
The fracture toughness, characteristic length and damage mechanism of HSC, MSC and NSC are discussed in the paper, based on the compression, bending and fracture experiment data of HSC, MSC and NSC. 以HSC、MSC和NSC抗压、弯折和断裂试验数据为依据,针对HSC、MSC和NSC的断裂韧度、特征长度及破坏机理展开讨论。
The parameters of the soil water characteristic curve are estimated by the observed characteristic length of wetted zone and sorptivity. Unsaturated hydraulic conductivity is estimated from the parameters determined in the soil water characteristic curve and the measurement of saturated hydraulic conductivity. 土壤水分特征曲线中的参数由观测的水平立柱的特征湿润长度和吸力来确定,非饱和土壤导水率由已确定的特征曲线中的参数和测定的饱和导水率导出。
Further analysis shows that the material characteristic length scale is dependent on the density of geometrically necessary dislocation inside the materials. It is also suggested that the size effect dominated by strain gradient can be quantified by the material characteristic length scale. 进一步分析表明,多晶和单晶Cu薄膜的特征尺度依赖于材料内部的几何需要位错密度,其中材料特征尺度表征了应变梯度控制的尺寸效应。
The characteristic length l_ ( ch) was used to evaluate the effects of coarse aggregate size and silica fume dosage on the brittleness of concrete. )和临界裂缝尖端张开位移(CTODc),同时利用特征长度l~(ch)研究粗骨料粒径和硅灰掺量对混凝土脆性的影响。文章也给出了相应的弹性模量、抗压强度以及抗拉强度。
The relationship between sloshing frequencies, damping of different parts and characteristic length, characteristic kinematic viscosity, characteristic acceleration of gravity is obtained. 得到了晃动的固有频率及各部分阻尼随特征长度、特征运动粘性系数以及特征重力加速的变化关系。
The characteristic length about micro-combustion system is small, and its flow, heat transfer and combustion has many different characteristic that large size of the combustion systems has. 微型燃烧系统的特征长度很小,其流动、传热和燃烧具有的特性,与大尺寸的燃烧系统有许多不同。
Using a high-speed camera and image processing software, the author analyzed the breakup regime, characteristic length, and breakup duration of the liquid drop under different conditions in detail, and discussed the secondary regime of liquid drops. 2. 用高速摄像仪和图像处理软件,对液滴在不同条件下的破裂模式、特征长度、破裂时间等进行了详细研究分析,探讨了液滴的二次雾化机理。
The second chapter describes the basic electromagnetic theories and features, such as excitation modes and four characteristic length parameters of surface plasmon polaritons. 第二章介绍了表面等离子体激元的基本电磁理论和性质,表面等离子体激元的激发方式和四个特征长度参数等。
When the characteristic length of the flow field reaches micro or sub-micron level, some factors that can be neglected in macro level may take the dominant parts, which may result in some strange phenomenon. 当流场特征尺寸为微米或亚微米量级时,一些常规大尺度流动中可以被忽略的因素可能在流动中占据主导地位,从而导致各种奇异的微尺度流动现象。
There is mounting experimental evidence that materials display strong size effects when the characteristic length scale associated with non-uniform plastic deformation is on the order of microns. 越来越多的实验证实当非均匀塑性变形的特征长度在微米量级时材料呈现出很强的尺寸效应。
In recent years, the massive experiments in micro scale showed that when the materials 'characteristic size of deformation field is in microns or sub-microns, strong size effects will display, and their mechanical behaviors are related to the materials' intrinsic characteristic length. 近年来大量的微细观实验研究表明,当材料的变形特征尺寸在微米或亚微米量级时,其力学行为与材料的内秉特征长度相关,体现出强烈的尺度效应。